This is very easy event. I used a single deck to finish the while thing, and that deck is Sixsams. Wave change shenanigans were beaten easily with either dual wield, divine wrath or karma cut. I didn't lost a single wave or stage.
Yea I don't understand how someone can struggle with this event unless you're a week-old newbie. You don't even need to adhere to the rules and just use whatever monster cards instead of being locked to fire decks.